How do tree hollows form?

Tree hollows form in the trunk or branches of live or dead trees, and usually are found in much older trees, typically 100-150 years old.

Because they take so long to form, and are so important as habitat for many of our native animal species, it is very important that they are retained wherever possible.

Hollows form as a result of limbs being broken off in the wind, lightning strike, fire or after attack by termites, other insects or fungi. They can be large or small – 18-30 cm or 2-6 cm respectively.

How can we help keep tree hollows?

When undertaking developments or landscaping, efforts should be made to avoid and protect all trees with hollows including dead standing trees wherever possible. An arborist can assist to ensure these are kept in a safe condition.

Additionally, young trees also need to be kept or replanted to
develop into trees that will form hollows later for future animals.

In
areas where natural tree hollows are scarce, next boxes can be used as
artificial hollows for many hollow-dependent fauna species. Artificial hollows may be created by an arborist in stag trees as opportunities arise. Whilst nest
boxes can increase habitat for many fauna species, they should not be
considered a replacement for natural tree hollows.